2. In a large bowl, combine the cheeses for the cake with the eggs, milk, baking powder, and lemon zest. Mix with a spatula or a mixer.
3. Grease a springform pan generously or line it with parchment paper.
4. Pour the mixture into the pan and bake for 45-50 minutes. After 20 minutes, cover with aluminum foil to prevent the cake from browning.
5. For the sauce, put the blueberries or red berries in a saucepan. Add a little water and cook until the water evaporates. If needed, add a little stevia or other sweetener.
6. Let the cake cool completely, then serve it with the sauce.